diff --git a/compiler/rustc_symbol_mangling/src/legacy.rs b/compiler/rustc_symbol_mangling/src/legacy.rs
index de18614360ef5..cdea84a8d60f7 100644
--- a/compiler/rustc_symbol_mangling/src/legacy.rs
+++ b/compiler/rustc_symbol_mangling/src/legacy.rs
@@ -13,7 +13,7 @@ use tracing::debug;
 use std::fmt::{self, Write};
 use std::mem::{self, discriminant};
 
-pub(super) fn mangle(
+pub(super) fn mangle<'tcx>(
     tcx: TyCtxt<'tcx>,
     instance: Instance<'tcx>,
     instantiating_crate: Option<CrateNum>,
@@ -199,7 +199,7 @@ struct SymbolPrinter<'tcx> {
 // `PrettyPrinter` aka pretty printing of e.g. types in paths,
 // symbol names should have their own printing machinery.
 
-impl Printer<'tcx> for &mut SymbolPrinter<'tcx> {
+impl<'tcx> Printer<'tcx> for &mut SymbolPrinter<'tcx> {
     type Error = fmt::Error;
 
     type Path = Self;
@@ -345,7 +345,7 @@ impl Printer<'tcx> for &mut SymbolPrinter<'tcx> {
     }
 }
 
-impl PrettyPrinter<'tcx> for &mut SymbolPrinter<'tcx> {
+impl<'tcx> PrettyPrinter<'tcx> for &mut SymbolPrinter<'tcx> {
     fn region_should_not_be_omitted(&self, _region: ty::Region<'_>) -> bool {
         false
     }
diff --git a/compiler/rustc_symbol_mangling/src/lib.rs b/compiler/rustc_symbol_mangling/src/lib.rs
index bb7b452955609..d91f6d53409d5 100644
--- a/compiler/rustc_symbol_mangling/src/lib.rs
+++ b/compiler/rustc_symbol_mangling/src/lib.rs
@@ -90,7 +90,6 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![feature(never_type)]
 #![feature(nll)]
-#![feature(in_band_lifetimes)]
 #![feature(iter_zip)]
 #![recursion_limit = "256"]
 
@@ -117,7 +116,7 @@ pub mod test;
 /// This function computes the symbol name for the given `instance` and the
 /// given instantiating crate. That is, if you know that instance X is
 /// instantiated in crate Y, this is the symbol name this instance would have.
-pub fn symbol_name_for_instance_in_crate(
+pub fn symbol_name_for_instance_in_crate<'tcx>(
     tcx: TyCtxt<'tcx>,
     instance: Instance<'tcx>,
     instantiating_crate: CrateNum,
@@ -132,7 +131,7 @@ pub fn provide(providers: &mut Providers) {
 // The `symbol_name` query provides the symbol name for calling a given
 // instance from the local crate. In particular, it will also look up the
 // correct symbol name of instances from upstream crates.
-fn symbol_name_provider(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> ty::SymbolName<'tcx> {
+fn symbol_name_provider<'tcx>(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> ty::SymbolName<'tcx> {
     let symbol_name = compute_symbol_name(tcx, instance, || {
         // This closure determines the instantiating crate for instances that
         // need an instantiating-crate-suffix for their symbol name, in order
@@ -152,14 +151,14 @@ fn symbol_name_provider(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> ty::Symb
 }
 
 /// This function computes the typeid for the given function ABI.
-pub fn typeid_for_fnabi(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> String {
+pub fn typeid_for_fnabi<'tcx>(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> String {
     v0::mangle_typeid_for_fnabi(tcx, fn_abi)
 }
 
 /// Computes the symbol name for the given instance. This function will call
 /// `compute_instantiating_crate` if it needs to factor the instantiating crate
 /// into the symbol name.
-fn compute_symbol_name(
+fn compute_symbol_name<'tcx>(
     tcx: TyCtxt<'tcx>,
     instance: Instance<'tcx>,
     compute_instantiating_crate: impl FnOnce() -> CrateNum,
diff --git a/compiler/rustc_symbol_mangling/src/test.rs b/compiler/rustc_symbol_mangling/src/test.rs
index f7d68b5cc7061..700765a351ce1 100644
--- a/compiler/rustc_symbol_mangling/src/test.rs
+++ b/compiler/rustc_symbol_mangling/src/test.rs
@@ -31,7 +31,7 @@ struct SymbolNamesTest<'tcx> {
     tcx: TyCtxt<'tcx>,
 }
 
-impl SymbolNamesTest<'tcx> {
+impl SymbolNamesTest<'_> {
     fn process_attrs(&mut self, def_id: LocalDefId) {
         let tcx = self.tcx;
         for attr in tcx.get_attrs(def_id.to_def_id()).iter() {
@@ -59,7 +59,7 @@ impl SymbolNamesTest<'tcx> {
     }
 }
 
-impl hir::itemlikevisit::ItemLikeVisitor<'tcx> for SymbolNamesTest<'tcx> {
+impl<'tcx> hir::itemlikevisit::ItemLikeVisitor<'tcx> for SymbolNamesTest<'tcx> {
     fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
         self.process_attrs(item.def_id);
     }
diff --git a/compiler/rustc_symbol_mangling/src/v0.rs b/compiler/rustc_symbol_mangling/src/v0.rs
index 0363ddb0e6eee..167ff758f3480 100644
--- a/compiler/rustc_symbol_mangling/src/v0.rs
+++ b/compiler/rustc_symbol_mangling/src/v0.rs
@@ -17,7 +17,7 @@ use std::fmt::Write;
 use std::iter;
 use std::ops::Range;
 
-pub(super) fn mangle(
+pub(super) fn mangle<'tcx>(
     tcx: TyCtxt<'tcx>,
     instance: Instance<'tcx>,
     instantiating_crate: Option<CrateNum>,
@@ -56,7 +56,7 @@ pub(super) fn mangle(
     std::mem::take(&mut cx.out)
 }
 
-pub(super) fn mangle_typeid_for_fnabi(
+pub(super) fn mangle_typeid_for_fnabi<'tcx>(
     _tcx: TyCtxt<'tcx>,
     fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
 ) -> String {
@@ -118,7 +118,7 @@ struct SymbolMangler<'tcx> {
     consts: FxHashMap<&'tcx ty::Const<'tcx>, usize>,
 }
 
-impl SymbolMangler<'tcx> {
+impl<'tcx> SymbolMangler<'tcx> {
     fn push(&mut self, s: &str) {
         self.out.push_str(s);
     }
@@ -250,7 +250,7 @@ impl SymbolMangler<'tcx> {
     }
 }
 
-impl Printer<'tcx> for &mut SymbolMangler<'tcx> {
+impl<'tcx> Printer<'tcx> for &mut SymbolMangler<'tcx> {
     type Error = !;
 
     type Path = Self;